feat: add PHPUnit run configuration template

- Created a new template for PHPUnit run configuration in the project. This includes settings for test runner and configuration file.

.idea/runConfigurations/_template__of_PHPUnit.xml

+<component name="ProjectRunConfigurationManager">
+  <configuration default="true" type="PHPUnitRunConfigurationType" factoryName="PHPUnit">
+    <TestRunner configuration_file="$PROJECT_DIR$/phpunit.xml" scope="XML" use_alternative_configuration_file="true" />
+    <method v="2" />
+  </configuration>
+</component>
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